| Hint | Answer | % Correct |
|---|---|---|
| A natural satellite orbiting a planet. | Moon | 100%
|
| The star at the center of our solar system, providing heat and light. | Sun | 100%
|
| The theory that the universe began from an extremely dense and hot state and has been expanding. | Big Bang Theory | 90%
|
| A system of billions of stars, gas, and dust bound by gravity. | Galaxy | 90%
|
| A celestial body orbiting a star, large enough to be spherical and clear its orbit. | Planet | 80%
|
| A star and all the objects gravitationally bound to it, including planets. | Solar System | 80%
|
| A massive ball of gas undergoing nuclear fusion, emitting light and heat. | Star | 80%
|
| All of space, time, matter, and energy, including galaxies, stars, and planets. | Universe | 80%
|
| The layer of gases surrounding Earth. | Atmosphere | 70%
|
| The regions of Earth that support life. | Biosphere | 60%
|
| The curved path of one object around another due to gravity. | Orbit | 60%
|
| The stretching of light waves, making them appear redder, indicating an object is moving away. | Red Shift | 60%
|
| The variety of life in a particular habitat or the entire planet. | Biodiversity | 50%
|
| The compression of light waves, making them appear bluer, indicating an object is moving closer. | Blue Shift | 50%
|
| Long-term shifts in temperature, weather patterns, and ecosystems. | Climate change | 50%
|
| All the water on Earth's surface, underground, and in the atmosphere. | Hydrosphere | 50%
|
| The faint radiation left over from the Big Bang. | Cosmic microwave background radiation | 20%
|
| The solid, rocky part of Earth, including the crust, mantle, and core. | Geosphere | 20%
|
| The trapping of heat in Earth's atmosphere by greenhouse gases. | Greenhouse effect | 20%
|
| A star's brightness as it would appear from a standard distance. | Absolute magnitude | 10%
|
| The observation that galaxies move away faster as their distance increases. | Hubble’s Law | 10%
|